What is transfer reactance
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Answer:
A transient is a short-lived burst of energy in a system caused by a sudden change of state.
Transient and sub-transient reactance are generally the terms which appear in the calculation of fault current.
An important factor in determining the magnitude of a fault current is a variable reactance that changes rapidly after the initiation of the fault until it reaches a steady state.
Subtransient Reactance, usually denoted as X''d, is the reactance used to determine the current during the first cycle after the occurance of the fault.
In about 0.1 second this reactance increases to the level known as Transient Reactance usually denoted as X'd, and after 0.5 to 2 seconds it increases to the leven known as Synchronous Reactance and denoted as Xd, and this determines the fault current after a steady condition is
reached.
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